Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 68 · 40 questions

What you do (Yeast is alive): 1. Pour warm (not hot) water into the bottle — an adult checks it. 2. Add the yeast and the sugar and swirl gently. 3. Stretch the balloon over the bottle’s mouth. 4. Wait 30 minutes, measure the balloon, then pour the mixture away and wash up.

1. 1.🔍 Which is the odd one out? (a) time (b) sugar (c) sunlight (d) warm water
2. 2.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) False (b) True
4. 4.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold slows yeast down (c) cold makes it pink (d) cold water is heavy
5. 5.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) keep it for a month (d) put it in your mouth
6. 6.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a paper clip (c) sugar (d) a comb
7. 7.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
8. 8.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
9. 9.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) warm, not hot (d) ice cold
10. 10.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
11. 11.True or false: sugar is something yeast does not need. (a) True (b) False
12. 12.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) it shrinks to nothing (d) the balloon is smaller
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) True (b) False
14. 14.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to clean floors (d) to make bread rise
15. 15.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
16. 16.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) a magnet (d) warm water
17. 17.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the water temperature”? (a) we measure it (b) we change it (c) we keep it the same
18. 18.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
19. 19.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) the amount of sugar (c) the amount of yeast (d) size of the balloon
20. 20.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a battery cell (c) turmeric powder (d) dry yeast
21. 21.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
22. 22.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it heavy (c) to make it sweet (d) to colour it
23. 23.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) vinegar (d) sugar
24. 24.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) steam (d) carbon dioxide gas
25. 25.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) True (b) False
26. 26.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) a balloon (d) a battery cell
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of yeast”? (a) we change it (b) we measure it (c) we keep it the same
28. 28.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
29. 29.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
30. 30.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
31. 31.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is the one thing we change? (a) the amount of water (b) size of the balloon (c) the amount of sugar (d) the water temperature
33. 33.🍞 Which of these is something yeast does not need? (a) warm water (b) salt (c) time (d) sugar
34. 34.True or false: sugar is something yeast needs. (a) True (b) False
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) sunlight (d) time
37. 37.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
38. 38.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
39. 39.🔍 Which is the odd one out? (a) warm water (b) time (c) salt (d) sugar
40. 40.True or false: a magnet is something yeast needs. (a) True (b) False

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